CAJ | 학술논문

针对焊缝早期隐性损伤临界状态磁记忆特征提取及评价难题，在大量试验基础上提出双正交法：即焊缝检测路径的正交性和磁场矢量分析的正交性。以 Q235B 焊接试件为试验材料，通过测量焊缝纵向和横向磁记忆信号分布，引入磁场正交矢量空间图和李萨如图，研究疲劳载荷下焊缝隐性损伤演化的磁记忆表征规律，对比扫描电镜和 X 射线检测结果，获得焊缝早期隐性损伤临界状态磁记忆特征：隐性损伤出现时李萨如图会产生涡动性的局部闭合，随着损伤的扩展涡动性局部闭合的面积越来越大直至断裂时完全闭合。在此基础上提出正交矢量梯度积分S(K)和正交矢量合成梯度比Kr的概念，建立Kr与剩余寿命Nr定量关系模型，为焊缝早期隐性损伤临界状态的定量研究提供一种新的思路。
침대한봉조기은성손상림계상태자기억특정제취급평개난제，재대량시험기출상제출쌍정교법：즉한봉검측로경적정교성화자장시량분석적정교성。이 Q235B 한접시건위시험재료，통과측량한봉종향화횡향자기억신호분포，인입자장정교시량공간도화리살여도，연구피로재하하한봉은성손상연화적자기억표정규률，대비소묘전경화 X 사선검측결과，획득한봉조기은성손상림계상태자기억특정：은성손상출현시리살여도회산생와동성적국부폐합，수착손상적확전와동성국부폐합적면적월래월대직지단렬시완전폐합。재차기출상제출정교시량제도적분S(K)화정교시량합성제도비Kr적개념，건립Kr여잉여수명Nr정량관계모형，위한봉조기은성손상림계상태적정량연구제공일충신적사로。
According to the bottleneck of metal magnetic memory (MMM) critical characteristic extracting for early hidden damage of welded joints, the biorthogonal method is presented, that is, the orthogonal testing path and the MMM orthogonal vector analysis based on experiments. The experimental materials are Q235B welded plate specimens. By measuring the normal component and the tangential component signals, the magnetic field vector space figure and the Lissajous figure are introduced. By contrasting the results of scanning electron microscope and X ray detection, the MMM changing laws and the critical characteristics of early hidden damage are obtained. The Lissajous figure becomes partial closure when the early hidden damage occurs. And the partial closure area becomes larger and larger with the expansion of the hidden damage. Furthermore, the Lissajous figure becomes completely closed till the specimen is broken. At last two new MMM parameters are presented, that is, the integral of orthogonal gradient vector (S(K)) and the ratio of orthogonal gradient vector sum (Kr). And the quantitative relational model between Kr and the residual life ratio Nr is built which provides a new quantitative evaluation tool of early hidden damage for welded joints in practical engineering.